气候变化领域集成服务门户(CCPortal): Periodic changes in the Cretaceous ocean and climate caused by marine redox see-saw

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DOI	10.1038/s41561-019-0359-x
	Periodic changes in the Cretaceous ocean and climate caused by marine redox see-saw
	Wallmann K.; Flögel S.; Scholz F.; Dale A.W.; Kemena T.P.; Steinig S.; Kuhnt W.
发表日期	2019
ISSN	17520894
卷号	12 期号:6
英文摘要	Periodic changes in sediment composition are usually ascribed to insolation forcing controlled by Earth’s orbital parameters. During the Cretaceous Thermal Maximum at 97–91 Myr ago (Ma), a 37–50-kyr-long cycle that is generally believed to reflect obliquity forcing dominates the sediment record. Here, we use a numerical ocean model to show that a cycle of this length can be generated by marine biogeochemical processes without applying orbital forcing. According to our model, the restricted proto-North Atlantic and Tethys basins were poorly ventilated and oscillated between iron-rich and sulfidic (euxinic) states. The Panthalassa Basin was fertilized by dissolved iron originating from the proto-North Atlantic. Hence, it was less oxygenated while the proto-North Atlantic was in an iron-rich state and better oxygenated during euxinic periods in the proto-North Atlantic. This redox see-saw was strong enough to create significant changes in atmospheric pCO2. We conclude that most of the variability in the mid-Cretaceous ocean–atmosphere system can be ascribed to the internal redox see-saw and its response to external orbital forcing. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	atmosphere-ocean system; carbon dioxide; Cretaceous; marine environment; obliquity; orbital forcing; paleoceanography; sediment analysis; Tethys; Atlantic Ocean; Atlantic Ocean (North)
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124656
作者单位	GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Institut für Geowissenschaften, University of Kiel, Kiel, Germany
推荐引用方式 GB/T 7714	Wallmann K.,Flögel S.,Scholz F.,et al. Periodic changes in the Cretaceous ocean and climate caused by marine redox see-saw[J],2019,12(6).
APA	Wallmann K..,Flögel S..,Scholz F..,Dale A.W..,Kemena T.P..,...&Kuhnt W..(2019).Periodic changes in the Cretaceous ocean and climate caused by marine redox see-saw.Nature Geoscience,12(6).
MLA	Wallmann K.,et al."Periodic changes in the Cretaceous ocean and climate caused by marine redox see-saw".Nature Geoscience 12.6(2019).